TSB #131 - January 16, 19701969 and 1970 All CarlinesRemove the outer brake shoes from the calipers and identify the shoes to assure reinstallation in the correct calipers. Do not reverse. Remove the noise arrestor clips if so equipped and discard. Thoroughly clean the outer surface of the shoes with a wire brush. Position shoe in a vise and cut two grooves in the lining as shown in Figure 2. The grooves should be 1/8" wide and cut to within 3/16" of the metal base of the shoe. Install outer shoe assemblies to their proper calipers and add fluid to the master cylinder as required. Pump the brake pedal to position the shoes before moving the vehicle.

NOTE: Rotors should not be needlessly machined in an attempt to eliminate disc brake squeal.